In July of the 24th year of Jian 'an, after Liu Bei occupied Hanzhong, he became the king of Hanzhong, and his son Liu Chan became Wang Shizi. Liu Bei led hundreds of officials back to Chengdu, built palaces, widely accumulated grain and grass, and made more weapons in an attempt to attack the Central Plains. Cao Cao was furious, so he incited Sun Quan to attack Jingzhou and took the opportunity to crusade against Hanzhong. Liu Bei named Guan Yu the head of the Five Tigers, before Zhang Fei, Zhao Yun, Ma Chao and Huang Zhong. Liu Bei ordered Guan Yu to attack Fancheng. Guan Yu gave up Kong Minglian's strategy of resisting Cao Wu, rudely rejected the marriage proposal messenger sent by Sun Quan, and then left a few people to defend Jingzhou, led his own military forces to attack Xiangyang, and fought against Coss, winning the first battle.